<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="./lib/react.development.js"></script>
    <script src="./lib/react-dom.development.js"></script>
    <script src="./lib/babel.min.js"></script>
</head>

<body>
    <div id="root"></div>

    <!-- 
        <div>
            <h1>123</h1>
            <p>
                <span>123</span>
            </p>
        </div> 
    -->
</body>
<script type="text/babel">
    const root = ReactDOM.createRoot(document.querySelector("#root"));
    const oDiv = React.createElement('div', null,
        React.createElement('h1', null, 123),
        React.createElement('p', null,
            React.createElement('span', null, 123)
        )
    )
    root.render(oDiv);
</script>

</html>